Chrysazin dye and process of making same



IINITED STATES PATENT OFFIcE.

ROBERT E. SCHMIDT, OF ELBERFELD, GERMANY, ASSIGNOR TO THE FARBEN- FABRIKEN OF ELBERFELD COMPANY, OF NEW YORK.

CHRYSAZIN DYE AND PROCESS OF MAKING SAME.

SPECIFICATION forming part of Letters Patent No. 623,219, dated April 18, 1899.

' Application filed March 16,1898. Serial No. 674,033. pecimens.)

To CbZZ whom, it may concern: I chlorid '(or another alkaline chlorid) and Be it known that I, ROBERT E. SCHMIDT, cooled. Thus the acid ammonium salt of the doctor of philosophy, chemist, residing at Elparadihydroxylaminchrysazin disulfo acid berfeld, Germany, (assignor to the FARBEN- having the formula FABRIKEN or ELBERFELD COMPANY, of New OH (1 V 55 York,) have invented a new and useful Im- OH provement in Ohrysazin Dyes; and I hereby OHM) declare the following to be a clear and exact O H O description of my invention. i ro' In the specification of Letters Patent No. Z 60 595,350, dated December 14, 1897, granted to the Farbenfabriken, vormals Fr. Bayer & is precipitated in the form of small needle- Oo., of Elberfeld, Germany, I have described shaped crystals. Finally this precipitate is that by a complete reduction of the nitro filtered, dried, and pulverized. It represents groups contained in the dinitrochrysazin dia dark powder soluble in water with a violet 65 sulfo acid with the aid of stannous chlorid color, which changes into green on the addiand muriatic'acid diamidochrysazin disulfo tion of soda-lye. By concentrated sulfuric acid is obtained. I now have found that if acid it is dissolved with a yellow color. The only such quantities of the said reducing coloring-matter dyes unmordanted wool in agent as correspond with eight atoms of hyacid-baths blue shades and yields on chro- 7o drogen are allowed to act on one molecule of mium mordants bluish-green shades. dinitrochrysazin disulfo acid the reduction \Vhen treated with reducing agents such as does not proceed so far, the nitro groups not stannous chlorid and muriatic acid, the new being transformed into amido groups, but into dyestuff is transformed into the diamidohydroxylamin groups. Thus a new dyestuff chrysazin disulfo acid claimed in the above- 75 is obtained, which is a disulfo acid of paramentioned Letters Patent No. 595,350.

dihydroxylaminchrysazin' of the formula: Having now described my invention andin OH OH what manner the same is to be performed, CO what I claim as new, and desire to secure by 8 A 1 Letters Patent, is 80 7 2 1. The process for produclng a new anthraquinone dyestuff, being an acid salt of a di- 6 3 v sulfo acid of paradihydroxylaminchrysazin, cc 4 having the formula NHLIOH union OH OH 5 I co In carrying out my new process practically I can proceed as follows, (the parts are by weight:) Five parts of paradinitrochrysazin- 4o disulfonate of sodium are dissolved in two 9o hundred and fifty parts of water. To the reco sulting solution a mixtureprepared from eight l parts of stannous chlorid, thirty parts of water, and thirty liters (in case the parts are which process consists in reducing one mole- 5 kilos, by weight) of concentrated hydrochloric cule of dinitrochrysazin disulfo acid with such 9 acid is slowly added, with stirring. The'requantities of reducing agents as correspond action mixture, which immediately assumes to eight atoms of hydrogen, thereby transa blue color, is heated to about from to forming the nitro groups into hydroxylamin (50 centigrade. Subsequently it is mixed groups, substantially as described. V

50 with a concentrated solution of ammonium 2. As a new article of manufacture the new anthraquinone dyestuif being an acid salt of the acid having the formula OH. OH 8 NH.OH 4 OHHQOQ NH.OH%5;

S0311 so n IO which is in the shape of the acid ammonium salt a dark powder soluble in water-with a violet color which changes into green on the addition of soda-lye, being dissolved by concentrated sulfuric acid with a yellow color,

dyeing wool in acid-baths blue shades, and yielding on chromium mordants bluish-green shades, being transformed into diarnidochrysazin disulfo acid when treated with reducing agents, for which purpose stannous chlorid and muriatic acid may be used, substantially as described.

In testimony whereof I have signed my name in the presence of two subscribing witnesses.

ROBERT E. SCHMIDT. Witnesses:

R. E. J AHN, OTTO Komc. 

